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The LCM of the given numbers is the product of all different prime factors to their greatest power. If there are no exponents, the greatest power of the prime factors is 1 and each different prime factor is used in the multiplication:
prime factors of 15 are 3 x 5;
prime factors of 21 are 3 x 7;
the LCM of 15 and 21 is 3 x 5 x 7 = 105
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What is the prime factorization of the composite number 42?
42=2x21 21=3x7 PF=2x3x7 The PF (Prime Factorization) of 42 is 2x3x7.(Sorry, I couldn't do a factor tree, there are always helpful to use when doing prime factorization, but since this is the computer, I could only do it like the following above.)
Is the prime number 21 is a prime number?
21 is a composite number, not a prime, having prime factors 3x7.
What prime number comes after 19?
23 Prime numbers are odd numbers and 21=3x7
What is the smallest prime number that is greater than 20?
21 = 3x7 ... not prime. 22 = 2x11 ... not prime. 23 is prime. 23.
Is 21 prime or not prime?
21 = 3x7, and so is not prime, as it can be expressed as the product of multiple prime numbers
